Sewing machine



c. w. MUELLER 2,038,848

' SEWING MACHINE Filed oct. 2, 1954 -April 28,1936.`

s Sheets-sheet 1 April 28, 1936. c. w. MUELLER SEWING MACHINE Filed Oct. 2, 1954 8 Sheets-Sheet 2 Ap .28, 1936. A c. w.` MUELLER V 1 SEWING MACHINE 8 Sheets-Seet 3 Filed 001;. 2, 1934 Il Hin Fill! April 2.8, l1936. l c. MUELLER SEWING MACHINE Filed oct. 2, 1854 8 Sheets-Sheet 4 April 28, 1936. c. w. MUELLER SEWING MACHINE `Filed OOb. 2, 1934 8 Sheets-Sheet 5 .QN w w u www w 'zaf'ler WMM @www 8 Sheets-Sheet 6 ww. L?

c. W. MUELLER SEWING MACHINE f Filed loche, 1954 N delle?? 28, 1936. w, MUE-LLER 2,038,848 SEWING MACHINE f 1 I Filed oct, 2,V 1934l s sng'ets-snet 7' wkgwfb .6N SW.,

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Patented pr. 28, 1936 UNITED sTATEs SEWING MACHINE Charles. W. Mueller, St. Louis, Mo., assignor to Lewis Invisible Stitch Machine Company, St. Louis, Mo., a corporation of Maine Application octtber 2, 1934, serial No. 746,519V2 31 Claims. (Cl. 112-176) This invention relates to new and useful improvements in blind stitch sewing machines generally, although more particularly to a machine for use in the manufacture of coats as described in my prior Patent 1,905,391 issued April 25, 1933.

Among the several objects of my invention are to provide a sewing machine having a post for supporting the work whereby a plurality of parallel lines of stitches may be readily formed in the layers of materials, the lines beginning at the left side of the material and working over to the right side thereof; to provide such a post machine with suflicient clearance ,under the upper arm of the machine for the work as it is fed rearwardly; to provide a vertically movable post for enabling the operator to insert and remove the work; to

' provide means for normally locking the post against downward movement; to provide manual means for releasing the locking means and for lowering the post without disconnecting or renderl With these and other objects in view which will 0 more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings:-

Figure 1 is a top plan view of a'sewing machine embodying my invention. a

Figure 2 is a bottom plan view thereof.

Figure 3 is a front elevation thereof, the post and the mechanisms carried thereon being shown in their normal positions.

Figure 4 is a right'handvslde lelevation of the machine. v 4

Figure 5 is a left hand side elevation of the machine, the cover on the forwardly extending upper arm being removed.

Figure 6 is a rear elevation showing the driving connections between the main shaft, the top feed lever, 'the needle shaft, and the looper shaft.

Figure 7 is an enlarged plan view partly in section, taken directly above the presser foot.

Y Figure 8 is an enlarged view taken directly below the foot.

Figure 9 is a detail plan view showing the relation vbetween the work clamp and the spring rollers.

` Figure 10 is a vertical section taken in the line I of feed and showing the post and the mechanisms carried thereon in their depressed positions.

Figure 11 is a horizontal sectional view taken Figure 12 is a vertical sectional view showing y the means for vertically guiding the post and the means for adjustably limiting the upper position of the post.

Figure 13 is a perspective view ofthe postv housing, the post, and the removable cover plate arranged in separated relation. v

Like reference numerals designate corresponding parts-throughout the several figures of the drawings. f

By reference to the accompanying drawings, will be seen that my invention includes a main frame A which comprises a standard 5 having an arm 6 extending laterally from the upper end thereof and terminating in a forwardly extending upper arm ,'I, and an arm 8 extending laterally from the base. of the' standard and terminating in a forwardly extending base arm '9; the upper arms l, 'I being spaced above and disposed in substantial registration with the baseiarms 8, 9.

Rigidly fixed `to the forward or free end of the upper arm 1, is a presser foot B having a centrally located longitudinal opening or slot I0 formed therein.

Journaled in the upper end of the standard 5 and in the upper arm 6 is a main shaft II. Journaled in the upper arm I and extending-longitudinally thereof is an oscillatory needle shaft I2 having a needle arm I3 fixed to its front end. This shaft I2 is located directly above the opening I0 of the presser foot B, and attached to the needle arm I3 is a curved needle I4 which reciprocates across said opening. The needle shaft I2 is oscillated from the main shaft II by connections which are indicated as a whole by the reference letter X. A looper or spreader I5 cooperates with the needle Il in the usual manner vertically movableftowards and from said foot, is

a work supporting post G. l'I'his post is rectangular in horizontal cross section, and is mounted in a. 2part stationary well or housing D, one part I'I thereof being integral with and projecting upwardly from the forward end of the base arm 9 and the other part IB constituting a-removable cover for the post and certain movable parts which are located therein. 'I'he upper `edge of the well D is located belowv and in spaced relation to the presser foot B, and the upper portion of the post C projects upwardly above said upper edge. The parts I1, I8 of the well D are conjointly formed with a rectangular opening to ridge-forming Aelement F.

freely receive thepost C. 'Ihe post is guided vertically by means `of front and rear vertically disposed grooves I5, 20 formed in the post,'and cooperating frontand rear vertical .guide bars 2l, 22 which are removably attached to the inner side face of the well by screws 2l as shown in Figs. 10 and 1l. The cover I5 is removably attached in place by screws 24, 24 as shown in Figs. 3 and 11. y

Carried by the post C and bodily movable up and down therewith are a work clamp E and a 'I'he work clamp E is mounted on theupper end of a vertical post 25 by means of a transverse pivot 25, the'post 25 being movable vertically in a bore 21 formed in the post C, and being nor. mally urged upwardly by a coil spring 25 located in the bore between the lower end thereof and the post. The post 25 is provided with a lower reduced extension which vextends through the coil spring 25 and through an opening in the housingl section I1. and stop nuts 25 are threadably engaged with the lower projecting end there'of for contact with the bottom surface of the post C to thereby limit the upward movement of the work clamp E relative to the post C.

The ridge 4forming element F is formed by a disc which is supported for backward and forward oscillations or reciprocations on. a transverse axis 30 mounted in ears 5|, 3l which project upwardly from the post C, the disc being located;

between the ears and in front of the post 25 of the work clamp E. The axis. I5 of the disc F is located below and in parallelism with the path of movement of thev needle I4, or in other words, at right angles tothe line of feed. '111el disc is positioned in a longitudinal opening 52 in the formed adjacent the radial wall 23 with a trans- Y verse groove forming a resultant feed tooth.

The disc F is oscillated from the main shaft Il in the following mannerz- Journaled in the base arm 5 of the frame and extending longitudinally thereof, is a rock shaft 55 which projects into the standard 5. An eccentric 31 is iixed to the main shaft Il, a rock arm 55 is fixed to the projecting end of the rock shaft 55, and a strap 55 connectsthe eccentric and the rock arm. A ver tically disposed lever 4I is fulcrumed intermediate its ends as at 4| to a lug 42 integral with the rear face of the post C. A rock arm v is nxed to the other end of the rock shaft 35, and a link 44 connects this rock armwith the lower end of' the lever 4l. A horizontal link 45 is pivotally connected at' its rear end to the upper en'dof the/lever 45, and at its frontend to the disc l' at a point below the axis thereof. It will be noted also seams being fed over theiridge forming disc r.'r6tn1send,tneptc nrormedwitnaeentrally disposed bore 4l which extends into the post from the lower 'end thereof, and mounted \s,oss,s4s

within the bore is a coreor support 41. A limit` A space is norspace is limited by the head of the screw 45 engaging the core. 'Ihe upper portion of the core is reduced to form a resultant peripheral recess for receiving a coil spring 4e which engages the bottom wall of the recess and the upper end wall of the bore 45 and functions to .yieldably retain .the post C against downward movement relative to the core.

The support or core 41 is normally locked against vertical movement but is capable of being so moved when the core is moved,land the post C,.the workJr clamp E and the disc F are moved with it. To this end, `a toggle is connectedfto the bottom of the core and to the base arm 9 of the.

main frame, and in the normal or upper position of the core the toggle is spring held in its locked or alined position, and a manual means is provided'for breaking the toggle and lowering the support against the tension of said spring holding means. 'I'he toggle includes a horizontal shaft which extends transve ly of the base l arm 5 and is mounted therein ectly below and in spaced relation to the support or core 41. lA Lreckvarm 5I is fixed to the shaft 55, and the upper end thereof is pivotally connected as 'at 52 to the lower end of a link 53 which is' plvotally connected -as at 54 to the lower portionof the support or core 41. Thus, when the pivots 50, 52 and 54 are in vertical alinement as shown inFigward movement. A heavy coil spring 55 extends longitudinally within the base arm e and has its rear end anchored to a' pin 55 xed to said arm. The forward end of the spring is connected by a link 51 to the rock arm 5|. Astop screw 55 is adjustably mouned in the arm 59 which is integral with and extends rearwardly from the rock arm 5l.y This stop screw 55 limits the rearward pull on the vtoggle by the spring 55 by reason of said screw contacting the base arm e as sho in Figure 4. A forwardly extending lever arm is integral with the rocky arm 5I and forms a resultant `hellcrank lever, vand connected. to the outer end -of this lever arm 50 is the upper end of a chain 5l which is connected at its lower end to a treadiez. Although I have shown a treadle connected to the toggle, it will be rstood that a knee-press orv any other ual means may be substituted if desired.

' In order to feed the material up to and past the needle I4 and disc F. I have/provided anin termittent topfeed mechanism of the'construction shown in my application Serial No. 771,825.

ined Jan. 22; 1934. Briefly stated, the feed meen- -anisin comprisesa feed'dog 5I which is located.A

in rear of the needle and operates through theslot Il of the presser foot B against the verti-` cally yieldablework clamp E. The feed dog is fixed to the forward end of a feed lever 54 which The rear end of the leviery 54 -iyconnected tol an eccentric 55 on the main shaft llwhiclrcoop-l 40 ure 4, the support or core is locked against downerates with the fulcrum 65' to impart backward machine for fabrics of different ,thicknesses I have provided a hand adjusting screw 61'which is-threadably engaged in a downwardly and rearwardly inclined opening extending into the rigid section I1 of the housing D from thefront thereof. The inner end of the screw contactsf'fthef.

upper edge of an upwardly and rearwardly inclined lever 68 fulcrumed at its forward end as at 69 to the section l1. The rear end of the lever 68 engages over a screw or shoulder 10 fixed to the left side of the post C. A head 1I which is fixed to the outer or forward end of the screw 61 is provided on its upper inclined face with a scale 12. The head is notched on its under face as at 13 for cooperation with a spring pin 14 mounted on the section i1 to yieldably retain lthe screw in an adjusted. position. Thus, by turning the screw in a clockwise direction, the lever 68 will be swung downwardly and thus through the medium of the shoulder screw 10, the post C will be lowered against the ten-r sion of the coil spring 49. Thus by this means the normal or operating position-of the disc F may be readily adjusted to suit fabrics of different weights.

Pivotally mounted on the under face of th presser foot B by pivot screws 16, 16 are levers 11, 11. These levers are disposed on opposite sides of the work clamp E and extend longitudinally thereof. Journaled on the rear end of each lever 11, 11 on a vertical axis 18 is a roller 19 having an inwardly beveled periphery 80. The bevels 80 register with, that is,'parallel, the in clined longitudinal edges 8 I, 8| 4of thework clamp E. The inner ends of the levers 11 are formed with upwardly extending ears 82, 82 which extend through slots 83, 83 formed in the toe or front portion of the presser foot B. Between 'the slots 83, 83 the presser foot is formed with spaced upstanding lugs 84, 84 which extend rearwardly from the front edge of the foot. A transverse horizontal pin 85 is positioned in openings formed in the lugs and the ends of this pin project laterally beyond said lugs toward the slots .83. Coil springs 86, 86 have their inner'ends disposed around the projecting ends of the pin 85 and bear against the lugs 84, the outer ends of said springs bearing against the ears 82 of the levers 11. Thus the springs normally hold the' ears l82 vagainst the outer walls of the slots 83 and thereby yieldably hold the rollers 19 in close proximity to the inclined edges 8| of the work clamp. Thus when fabrics are fed through lthe machine they are fed over the work clamp ent weights are being stitched from time to time, the spring rollers I9 will automatically accom-- morlate themselves to the passing of the fabric and seams.

In the operation of my-machine 'the normal position of the post C is first adjusted by means of the hand screw 61 whereby the normal position of the ridge 4forming disc F will be set for either making blind stitches or through stitches. 'I'he operator then depresses the treadle 62 which -lowers the post C together with the work clamp E and ridge forming element F to the position shown vin Figure 10, and the work is then inserted under the foot B while the post is held in its depressed position. 'The operator then releases the treadle 62 andthe spring 55 returns the post to its normal locked' position. 'I'he material is then fed through the machine in the usual manner, the work clamp 'E being moved downwardly during each feeding movement of the feed dog to thereby reduce the drag of the work between the foot and the clamp. The ridge forming disc F will be oscillated in timed relation to theneedle, and whenever/cross seams are encountered, the' disc will yield sufhciently by reason of the coil spring 49 to permit said seam being fed rearwardly. In coat work it is desirous to obtain the proper roll to the lapel when stitching the canvas to the body fabric, and by means of the spring pressed rollers 19 cooperating with the# inclined edges 8| of the bination with a frame including a standard, a

base arm extending horizontally therefrom, and an upper arm extending horizontally from the standard and disposed above and in spaced parallel relation to the base arm; of a presser foot fixed to the free end of said upper arm; a main shaft journaled in the standard; a stitch forming mechanism including a horizontally reciprocatory needle mounted on the free end of the upper varm above the'4 presser foot and having driving connections with the main shaft; a post. connected to the free end of said base arm direct- 1y under the foot; a vertically yieldable work clamp mounted on the post for cooperation with the stationary foot; a movable ridge formingelement mounted on the" post and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly through the foot into needle-penetrating 'position and having driving connections with the main shaft; and means actuated by the main shaft for intermittently feeding the material pastv the needle.

2. I n a blind stitch sewing machine, the combinatlon with a frame including a standard, a

allel relation to the base arm; of a presser foot fixed to the free end of said upper arm; a main shaft journaled in the standard; a stitch forming mechanism including a horizontally reciprocatory needle mounted on thefree end of the upper arm above the presser foot and having driving connections with the main shaft; a post connected to the free end of said base arm directly under the foot; a vertically yieldable work clamp mounted on the post for cooperation with the stationary foot; an oscillatory ridge forming disc mounted on the post and projecting upwardly through the Work clamp for intermittently projecting a ridge of material upwardly through the foot into needle-penetrating position andhaving vbase arm extending horizontally therefrom, and an upper arm'extendi'ng horizontally from the standard anddisposed above and in spaced par- 75 mounted on the post and projecting giving connections vvitn the main shari; and means actuated by the main shaft for intermittently feeding the material past the needle;

3. In a blind stitch sewing machine, the combinationwith a frame including astandard, a base arm extending horizontally therefrom, and

' an upper arm extending horizontally from the y standard and disposed above and in spaced parallel relation to the base arm; of a presser footl0 viiilred to the` free end of saidupper arm; a main shaft journaied in the tandard; .a stitch forming mechanism including horizontally reciprocatory needle mounted on the free end of the upper arm above the presser foot'and having driving connections with the main shaft; a post connected to the free end of said base arm directly under the foot: a vertically yieldable work clamp mountedv v on the post for cooperation with' the stationary foot; a reciprdcatory ridge forming element ymounted onvthe postfor intermittently projecting a ridge of material upwardly through the foot into needle-penetrating position; means for 4. In a blind stitch sewing machine, the combination with a frame including a'standard, .a

base arm 'extending horizontally therefrom, and an upper arm extending horizontally from the 3Q standard and disposed above and in spaced par- ,ilxed to the free end of said upper arm: a main shaft journaled inthe standard; a stitch forming mechanism including a horizontally reciprocatory 40 needle mounted on the free end of the' upper arm above the presser foot and having driving connections with the'main shaft; c. post mounted on the free end of the base arm for limited vertical movements; a lspring for yieldablyA retaining the post against downward movement; a vertically yieldable work clamp mounted on the post for v cooperation with the-stationary foot; a movable ridge forming element mounted on the post and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly through the foot into needle-penetrating Aposition and having driving connections with the main shaft; and means 'actuated lby the main shaft for intermittentlyfeedlng thematerial the needle. l

5. In a blind stitch'sewing machine, the coml bination with a :rune including a standard, a.

base arm extending horizontally therefrom, and anupper arm extending horizontally from the standard and disposed above and in spaced parallel relationto the base arm; of. a presser foot fixed to the'free end of said upper arm; a main shaft journaled inthe dard; a stitch forming .mechanism including a horizontally reciprocatory needle mounted on the 'free en'd of the upper arm above the presser foot and having driving connections, with the main shaft;` a post mounted on the free end of the base arm for limitedl vertical movements; va. spring for yieldabLv retaining in., mounted on the post for cooperation with the stati'i'ootamovable ridge forming element upwardly allel relation to the base arm; oi a pressenfoot through the work clamp for intermittently projecting a ridge vof material upwardly through the foot into needle-penetrating position and having' driving connections with the main shaft: and` means actuated by the main shaft for interrmttently feeding the material past the needle.

6. In a blind stitch sewing machina-the combination with a frame including a standard, a

-base arm extending horizontally therefrom, and f an upper arm extending horizontally from the standard and disposed above and in spaced parallel relation to the base arm; of a presser foot xed to the freeend of said upper arm; a main shaft joiutnaled in the standard; a stitch forming mechanism includlnga horizontally reciprocatory needle mounted on the free end of the upper arm above the presser foot and having vdriving connections with the main shaft; a post mounted on the free end of the base arm for limited vertical movements; a spring for yieldably retaining the post against downward movement; manually operable means for adjusting the normal height of the post, said means comprising a position and having driving connections with the main shaft; and means actuated by the main shaft for intermittently feeding the material past the needle.

'7. In' a blind stitch rsewing machine, the combination with a frame including a standard; an upper arm extending late ally from the upper end thereof and terminating i a forwardly extending arm, anda lower arm e tending laterally lfrom .the lowerv end of the standard and terminating in a forwardly extending arm, said upper and lower arms being disposed one above the other;` of a' .presser foot fixed to the free end of the upper arm; a main shaft journaled in the standard; a stitch forming mechanism including a horizontally recipr'ocatory needlemounted on the free end of the upper arm above the footv and having driving connections with the main shaft; a post mounted on the free end of the lower arm directly below the foot; a vertically yieldabie work vclamp mounted on the'post for cooperation with the foot; a movable ridge forming element 4mounted on the post.

and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly through the ioot` into needle penetrating position; driving connections between the ridge forming element and the main shaft, said connections extending along the lower arm and into the standard; and means actuated by the main shaft forlintermittently feeding the material .past the needle. y i

, 8. In asblind stitch sewing machine, the combinationwith a frame including a standard, an

upper arm extending laterally from the upper end thereof and terminating in a forwardly extending arm, and s. lowerI arm extending laterally from the lower end of the standard and terminating in a forwardly extending arm, said upperv and lower arms being disposed one above the other;

i of a presser foot fixed to the free end of the upper arm; a main shaft journaledin the standard; a. stitch forming mechanism a horizontally reciprocatory needle mounted on the free end of the upper arm above the foot and having driving connections with the main shaft; a post mounted on the free end of the lower arm directly comprising a lever fulcrumed intermediate its .l

ends on the post to swing about a horizontal axis, a'link connecting the upper end of the lever and the disc, and driving connections between the lower end of the lever and the mainshaft, said connections extending along the lower arm and into the standard; and means actuated by the main shaft for intermittently feeding the material past the needle.

9. In a blind stitch sewing machine, the' combination'with a frame including a standard, an upper arm extending laterally from the upper end thereof and terminating in a forwardly extending arm, and a lower arm extending laterally from the lower end of the standard and terminating in a forwardly extending arm, said upper and lower arms being disposed one above the other; of a presser foot fixed to the free end of the upper arm; a main shaft journaled in the standard; a stitch forming mechanism including a horizontally reciprocatory needle mounted on the free end of the upper arm above the loot and having driving con-Y nections with the main shaft; a post mounted on the free end of the base arm for limited vertical movements; a spring for yieldably retaining the post against downward movement; a vertically yieldable work clamp mounted on thepost for cooperation with the foot; a movable ridge forming element mounted on the post and projecting upwardly through the Work clamp for intermittently projecting a ridge of material upwardly through the foot into needle penetrating position;

driving connections between the ridge forming element and the main shaft, said connections extending along the lower arm and into the standard; and means actuated by the main shaft for intermittently feeding the material past the needle.

l0. In a blind stitch. sewing machine, the combination with a frame including a standard, an upper'arm extending laterally from the upper end thereof andterminating in a forwardly extending arm, and a lower arm extending laterally from the lower end of the standard and terminating in a forwardly extending arm, said upper and lower arms being disposed one above thev other; of a presser foot fixed to the free end of the upper arm; a main shaft journaled in the standard; a stitch forming mechanism including a horizontally re'- ciprocatory needle mounted on the free'end of the upper arm above the foot and 4having driving connections with the main shaft; a post mounted on the free end of the base arm for limited vertical movements; a spring for yieldably retaining the post against downward movement; manually operable means for adjusting the normal height of the post;v av vertically yieldable .work clamp mounted on the post for cooperation with the foot; a movable ridge forming element mounted on the post and projecting upwardlythrough the work clamp for intermittently projecting a ridge of material upwardly through the foot into needle penetrating position; driving connections between the ridge forming element and the main shaft,

said connections extending along the lower arm and into the standard; and means actuated by the main shaft for intermittently feeding the material past the needle.

l1. In a blind stitch sewing machine, the combination with a frame includingv a standard, an upper arm extending laterally from the upper end thereof and terminating in a forwardly extending arm, and a lower arm extending laterally from the lower end of the standard andterminating in a forwardly extending arm, said upper and lower arms being disposed one above the other; of a presser foot fixed to the free end of the upper arm; a main shaft journaled in the standard; a stitch` forming mechanism including a horizontally reciprocatory needle vmounted on the free end of the upper arm above the foot and having driving connections with the main shaft; a post mounted on the free end of the base arm for limited vertical movements; a spring for yieldably retaining the post against downward movement; manually operable means for adjusting the normal height of the post; saidy 1 means comprising a shoulder on the post, a lever pivoted on the lower frame arm and overlying the shoulder, and a hand screw mounted on the lower frame arm above the lever and engaging the latter; a vertically yieldable work clamp mounted on the post for cooperation with the foot; a movable ridge forming element mounted on the post and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly through the foot into needle penetrating position; driving connections between the ridge forming element and the main shaft, said connections extending along the lower arm and into the standard; and means actuated by the main shaft for interzriittently feeding the material past the needle.

12. In a blind stitch sewing machine, the combination with a frame including a standard, a base arm extending horizontally therefrom, and

an upper varm extending horizontally from .the

cooperation with the stationary foot; a movable ridge forming element mounted on the post and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly through the foot into needle-penetrating position and having driving connections with the main shaft; means actuated by the main shaft for intermittently feeding the material past the needle; means including a spring for normally holding said post against depression; and man- -ual means for depressing said post against said spring means. y

13. In a blind stitch sewing machine, the combination with a frame including a standard, a base arm extending horizontally therefrom, and

an upper arm extending horizontally from the Astandard and disposed above and in spacecl'sparallel relation tothe base arm; of a presser foot xed to the free end of said upper arm; a main shaft journaled in the standard; a stitch forming mechanism includinga horizontally reciprocatory ly projecting a ridge of material upwardly through the'foot into needle-penetrating position and having drivingconnectlons with the main shaft; means actuated by the main shaft for intermittently feeding the material past the needle; releasable means for locking the post against depression, and manual means for releasing said `locking means and for depressing said post.

14. In a blind stitch sewing machine, the combination with a.v frame including a standard, a base arm`extending horizontally therefrom, and

v anv upper arm extending horizontally from the standard and disposed aboveand in spaced parallel relation to the base'arm; of a presser foot fixed to the free -end of said upper arm; a main shaft journaled in the standard; a stitch forming mechanism including a horizontally reciprocatory needle mounted on the free end of the upper arm above the presser foot and havingl driving connections with the main shaft; a depressible post mounted on the free end of the lower arm directly under the foot; a vertically yieldable work clamp mounted on the post for cooperation with the stationary foot; a movable `ridge form-7 ing element mounted on the post and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly through the foot into needle-penetrating position and `having driving connections with the main shaft; means actuated by the main shaft for intermittently feeding the material past the needle; releasable means forf locking the post against depression comprising a toggle connection between the post and the lower arm and a springconnecting the toggle and the lower arm for nrmalLv retaining the toggle in locked position, and manual means connected to the toggle for breaking the latter and depressing the post against the tension of the spring,

15. In a blind stitch sewing machine, the combination with a frame including a standard, a base arm extending horizontally therefrom, and an upper arm extending horizontally from, the standard-and disposed above and in spaced parallell relation to the base arm; of a presser foot ,iixed to the free end of said upper arm; a main e er arm directly under the foot ;l a vertically yieldy,

able wor'k clamp ounted on the post for cooper-P ation with the s tiopary foot; af movable ridge forming element mounted on the post and` projecting upwardly through the work clamp for intermittently'projecting a ridge of material upvwardly through the foot into needle penetrating position and having driving connections-with'the' main shaft; means actuatedfby the main shaft for intermittently feeding the material past the 5 spring connecting the toggle and the lower arm ymechanism 'including a horizontally reciprocaupwardly through the work clamp for intermitcrank lever with the post, said spring connecting for normally retaining the toggle in 'locked pof sition; stop means between the toggle and the lower arm for limiting the locking movement of the toggle under the influence of the spring, and manual means connected to the toggle for break- 6 ing the latter and depressing the post against the tension of the spring.

,16. In a blind stitch sewing machine, the combination with aY frame including la standard, a\

base arm extending horizontallyV therefrom, and l0 an upper arm extending horizontally from the standard and disposed above and in spaced par.

allelrelation to the base arm; of a presser foot fixed to the free end of said upper arm; a main shaft journaled in the standard; a stitch forming tory needle mounted on the free end of-the upper varm above the presser foot and having driving der the influence of the spring, and manual means connected to the toggle for breaking the latter and depressing the post against the tension oi' the spring. f

` 17. In a blind stitch sewing machine, the combinaion'with a frame including a standard, a base arm extending horizontally'therefrom, and an 7upper arm extending horizontally from the standard and disposed above and in spaced parallel relation to the base arm; of a presser foot fixed to the'free end of saiduppe'r arm; a main shaft Journaled in the standard; a stitch forming mechanism including a horizontally reciprocatory needle mounted on the free end of the upper arm above the presser foot and having. driving connections with the main shaft; a depressible post mounted onthe free end of the low- 55 er arm directly under the foot; a vertically yieldable work` clamp mounted on the post for cooper-- ation with the stationary foot; a movable ridgeforming element mounted on the post and projecting upwardly through the work clamp for intermittently projecting a ridge of material upwardly thro h the foot into needle-penetrating position and having driving connections with the ,main shaft; means actuated byf the main shaft for intermittently feeding the material past the needle; releasable means for locking the post against depression comprising a toggle connectionfbetween the post and the lower arm and a spring connecting the toggleA and the lower'arm for normally retaining the toggle in locked position; said' toggle including a bellvcranklever fulcrumed on the lower arm below the post and ya link connecting 'the vertical arm of the bell the toggle and the lower amnmd manual means an upper arm extending horizontally from the standard and disposed above and in spaced parallel relation to the base arm; of a presser foot fixed to the free. end of said upper arm; amain shaft journaled in the standard; a stitch forming mechanism including a horizontallyreciprocatory needle mounted on the free end of the upper arm above the' presser foot and having driving connections with the main shaft; a depressible post mounted on the free end of the lower arm directly under the foot; a vertically yieldable work clamp mounted on the post for cooperation with the stationary foot; a movable ridge forming element mounted on the post and projecting upwardly through the work clamp for intermittently projecting a ridge .of material upwardly through the foot into needle-penetrating position and having driving connections with the main shaft; means actuated by the main shaft for intermittently feeding the material past the needle; releasable means for locking the postv and the lower arm, and manual means connected to the horizontal arm of the bell crank lever for breaking the toggle and depressing the post against the tension of the spring.

19. In a sewing machine, the combination with a frame including a standard, an upper arm extending laterally from the upper end thereof, and a lower arm extending laterally from the lower -end of the standard; of a stitch forming mechanism mounted on the free end of the upper arm, a depressible work-supporting post mounted "on the free end of the lower arm directly below said stitch forming mechanism, means including a spring for normally holding said post against depression, and manual means for depressing said post against the tension of said spring means.

20. In a sewing machine, the combination with a frame including a standard, an upper arm extending laterally from the upper end thereof,

and a lower arm extending laterally from the lower end of the standard; of a stitch forming mechanism mounted on the free end of the upper arm, a depressible work-supporting post mounted on the free end of the lower arm directly below said stitch forming mechanism, releasa-bl-e means for locking the post against depression, and manual means for releasing said'locking means and for depressing said post.

21. In a sewing machine, the combination'with I a frame including a standard, an upper arm extending laterally from the upper end thereof, 'and a lower arm extending laterally from the lower end of the standard; of a stitch forming mecha- I Y nism mounted on the `free end of the upper arm,

a depressible work-supporting post mounted on the free end ofthe lower arm directly below said stitch forming mechanism, releasable means for locking theV post against depression comprising a toggle connection between the post and the lower arm and a spring connecting the toggle and the lower arm for normally retaining the toggle in locked position, and manual means connected to the toggle for breaking the latter and de-` pressing the post against the .tension of the spring.

22. In a .sew-ing machine, the combination with a frame including a standard, an upper arm extending laterally from the upper end thereof, and a lower arm extending laterally from the lower end of the standard; of a stitch forming mechanism mounted on ,the free end of the upper arm, a depressible work-supporting post mounted on the free end of the lower arm directly below said stitch forming mechanism, releasable means for locking the post against depression comprising a toggle connection between the post and the lower arm and a spring connecting the toggle and the lower arm for normally'retaining the toggle in locked position, stop means between the toggle and the lower arm for limiting the locking movement of the toggle under the inuence ofthe spring, and manual means connected to the toggle for breaking the latter and depressing the post against' the tension of the spring.

23. In a sewing machine, the combination with a frame including a standard, an upper arm ex- -tending laterally from the upper end thereof, and

alower arm extending laterally from Ithe lower end of the standard; of a stitch forming mechanism mounted on the freer end of the upper arm, a depressible work-supporting post mounted on the free end of the lower arm directly below said stitch forming mechanism. releasable means forvv locking the post against depression comprisingV A a toggle connection between the post and the lower arm and a spring connectingthe toggle and the lower arm for normally retaining the toggle in locked position, an adjustable stop screw carried by the toggle for cooperation with the Y nism mounted on the free end of the Iupper arm, Aa depressible workfsupporting post mounted on the free end of the lower arm directlybelow said stitch forming mechanism, releasable means for locking the post against depression comprising a toggle connection between the post and the lower arm and a spring connectingthe toggle and the lower arm for normally retaining the toggle in locked position, said toggle including a bell crank lever fulcrumed on the lower arm 'below the post and a-link connecting the vertical arm of the bell crank lever with the post, said spring connecting the toggle and the lower arm, and

manual means connected to the horizontal arm of the hell crank lever for breaking the toggle and depressing the post against the tension of y the spring.

25. In a sewing machine, the combination with a frame including a standard, an upperarmextending laterally from the upper end thereof, and a lower arm-extending laterally from the lower end voi.' the standard; of a stitch forming mechanism mounted on the free end of the upper arm, a depressible work-supporting post mounted on the free end of the lowerarm directly below said stitch vforming mechanism, releasable means for locking `the post against depression comprising a toggle connection between the post and the lower arm and aspring connecting the toggle and the loyer arm fornormally retaining the toggle in locked position, said toggle including a bell crank lever fulcrumed on the lower arm below the posi'lv and a link connecting the vertical arm of the bell crank lever with the post, said spring connecting the toggle and the lower arm, stop means between the arm for limiting the locking movement of the toggle under the influence of the spring, and manual means connected to the horizontal arm of the bell crank lever for breaking the toggle and depressing the post against the tension of the spring. f

Y 26. In a blind stitch sewing machine, the combination with a stationary presser foot having an opening therein, of a stitch u forming mechanism located above the foot and including a horizontally reciprocatory needle movable across the presser foot opening, a vertically yieldable work clamp located below and cooperating with the foot,

said Vclamp having downwardly inclined side.- edges, a ridge forming element for projecting a ridge of material upwardly through the presser foot opening into yneedle penetrating position, a pair of pressure elements mounted on the foot on opposite sides of the work clamp and having inclined faces for cooperation with the inclined side edges of said clamp, and spring means urging the elements towards the clamp.

27. In a blind stitch sewing machine, the com bination with a stationarypresser foot having an opening therein, of a. stitch forming mechanism located above theroot and including a horizont/a1- ly reciprocatory needle movable across lthe presser foot opening, clamp located below and cooperatingewith the foot, said clamp having downwardly inclined side edges, aridge forming element for projecting a ridge of material upwardly through the presser foot opening into needle penetrating position, a pair oi pressure elementsmoun-ted on the foot on opposite sides of the work clamp and havingv inclined faces for cooperation with the inclined side edges 'of said clamp, spring means urging theelements towards the clamp, and means for limiting the movements of the elements towards the clamp.

28. In a blind stitch sewingmachine, the combination with `a stationary presser' foot having an opening therein, oi a stitch forming mechanism located above the foot and including a horizontally reciprotory needle `movable across the presser foot opening,v a vertically yieldable work clamp .located below and `cooperating with the foot, said clamp having downwardly inclined side edges, a ridge forming element for projecting a ridge of material upwardly throughthe presser foot opening into needle penetrating position, a pair of pressure rollers located below the foot on opposite sides oi the work clamp, said rollers having downwardly and inwardly inclined peripheries for cooperation with the inclined side edges of the clamp, means for supporting the'rollers;

n the foot for movements toward and from the toggle and` the lower a vertically yieldable worknism located above the footand including a horizontally reciprocatory needle movable across the presser foot opening, a -vertically yieldable work clamp located below and cooperating .with the foot, said clamp having downwardly inclined side edges, a ridge forming element for projecting a ridge of material upwardly through the presser foot opening into needle penetrating position, a pair of pressure rollers located below the foot on opposite sides of the work clamp, said rollers having downwardly and inwardly inclined peripheries'for cooperation with the inclined side edges of the clamp, means for supporting the rollers fon the foot for movements toward and from the work clamp, spring means urging the rollers toward the clamp, and means for limiting the movements of the rollers toward the clamp.

30. In a blind stitch sewing machine, the combination with a stationary press`er foot having an opening therein, ofga stitch forming mechanism located above the foot and including a horizontally 4rec1procatory needle movable across' the presser foot opening, a vertically yieldable ,work` clamp located below and cooperating with the foot, saidclamp having downwardly inclined side edges, a. ridge forming element for projecting a 'ridge of material upwardly through the presser foot opening into needle penetrating position, a pair of pressure rollers located below the foot on opposite sides of the work clamp, 'said rollers having downwardly and inwardly inclined peripheries for cooperation with the inclined sideedges of the clamp, a pair of levers extending longitudinally of the foot on opposite sides of the work clamp and'being' fulcrumed intermediate their ends on said foot, said rollers being journaled on the innerends of said levers, and spring means interposed betweemthe foot and the outer ends of the levers for urging the rollers toward the l work.clamp.

31. In a blind stitch sewing machine, the combination with a stationary presser foot ha ng-an opening therein, of a stitchiormin'g mec nism located above the foot and including a horizontally reciprocatory needle movable across the presser foot opening, a'vertically yieldable work clamp located below and cooperating with thel foot, said clamp having downwardlyinclined side edges, a ridge forming element for projecting a ridge of materialupwardly through the. presser foot opening into needle penetrating` position, a pair of pressure rollers located below the foot on opposite sides oi. the work. clamp, said rollers having downwardly and inwardly inclined periph,-

es for. cooperation with the inclined side edges of he clamp, a pair of levers extending longitudinally ofthe foot on opposite sides of the work clamp and being fulcrumed intermediate their ends on said foot,- saidfrollers being journaledon Y'the innerends of said levers, spring means inter-v posed between the foot and the outer ends oi' the levers for urging the rollers toward the work clamp,l and cooperating meansbetween' the outer ends of the levers and the foot for limiting the movement oi' the rollers toward the clamp.

CHARLES W. MUELLER. 

